<div id="a">
  <div class="permission-module">
    <div class="inputEx-ListField-childContainer">
      <div></div>
      <div></div>
    </div>
  </div>
</div>
<div id="b">
  <div class="permission-module">
    <div class="inputEx-ListField-childContainer">
    </div>
  </div>
</div>